<?php
class Page{
        private $total;         
        private $listRows;      
        private $limit;  
        private $uri;       
        private $pageNum;      
        private $page;          
        private $config=array(
            'head' => "条记录",
            'prev' => "上一页",
            'next' => "下一页", 
            'first'=> "首页",
            'last' => "末页"
        );
        private $listNum=10;
        public function __construct($total,$listRows=10,$query="",$ord=true){
         
                $this->total=$total;
                $this->listRows=$listRows;
                $this->uri = $this->getUri($query);
                $this->pageNum=ceil($this->total/$this->listRows);   
                if(!empty($_GET["page"])){           
                    $page=$_GET['page'];
                }else{
                    if($ord){
                        $page = 1;
                    }else{
                        $page = $this->pageNum;
                    }
                }
                if($total>0){
                    if(preg_match('/\D/',$page)){
                        $this->page = 1;
                    }else{
                        $this->page = $page; 
                    }
                }else{
                    $this->page = 0;
                }
                $this->limit="LIMIT ".$this->setLimit();    
        }
        function set($param,$value){
            if(array_key_exists($param,$this->config)){
                $this->config[$param] = $value;
            }
            return $this;
        }

        function __get($args){
            if($args == "limit"|| $args =="page"){            //过滤非法请求
                return $this->$args;
            }else{
                return null;
            }
        }
        function fpage(){
            $arr = func_get_args();
             $html[0]= "&nbsp;共<b> {$this->total} </b>{$this->config["head"]}&nbsp;";  
             $html[1]= "&nbsp;本页 <b>".$this->disnum()."</b> 条&nbsp;";       
             $html[2]= "&nbsp;本页从 <b>{$this->start()}-{$this->end()}</b> 条&nbsp;";  
             $html[3]= "&nbsp;<b>{$this->page}/{$this->pageNum}</b>页&nbsp;";  
             $html[4]= $this -> firstprev(); //上一页+首页
             $html[5]= $this -> pageList();  //页码列表1,2,3...
             $html[6]= $this -> nextlast();  //下一页+末页
             $html[7]= $this -> goPage();   
             $fpage='<div style="font:12px\'\5B8B\4F53\',san-serif;">';
             if(count($arr)<1){
                $arr = array(0,1,2,3,4,5,6,7);
             }
             for($i=0;$i<count($arr);$i++){
                $fpage .=$html[$arr[$i]];
             }
             $fpage .= '</div>';
             return $fpage;
        }
        private function setLimit(){
            if($this->page >0){
                return ($this->page-1)*$this->listRows.", {$this->listRows}";
            }else{
                return 0;
            }
        }
        private function getUri($query){
            $request_uri = $_SERVER["REQUEST_URI"];
            $url = strstr($request_uri,'?') ? $request_uri : $request_uri.'?';
            if(is_array($query)){
                $url .= http_build_query($query); 
            }elseif($query != ""){
                $url .= "&".trim($query,"?&");
            }
            $arr = parse_url($url);
            if(isset($arr["query"])){
                parse_str($arr["query"],$arrs);
                unset($arrs["page"]);
                $url = $arr["path"].'?'.http_build_query($arrs);
            }
            if(strstr($url,'?')){
                if(substr($url,-1) != '?'){
                    $url = $url.'&';
                }
            }else{
                $url = $url.'?';
            }
            return $url;
        }    
        private function start(){
            if($this->total==0){
                return 0;
            }else{
                return ($this->page-1)*$this->listRows+1;
            }
        }
        private function end(){
            return min($this->page*$this->listRows,$this->total);
        
        }
        private function firstprev(){
            if($this->page > 1){
                $str = "&nbsp;<a href='{$this->uri}page=1'>{$this->config["first"]}</a>&nbsp;";
                $str .= "<a href='{$this->uri}page=".($this->page-1)."'>{$this->config["prev"]}</a>&nbsp;";
                return $str;
            }
        }
        private function pagelist(){
            $linkPage = "&nbsp;<b>";
            $inum = floor($this->listNum/2);
            for($i=$inum;$i>=1;$i--){
                $page = $this->page-$i;
                if($page>=1)
                    $linkPage .= "<a href='{$this->uri}page={$page}'>{$page}</a>&nbsp;";
            }
            if($this->pageNum>1){
                $linkPage .= "<span style='padding:1px 2px; background:#BBB;color:white;'>{$this->page}</span>&nbsp;";
            }
            for($i=1;$i<=$inum;$i++){
                $page = $this->page+$i;
                
                if($page <= $this->pageNum){
                   
                    $linkPage .= "<a href='{$this->uri}page={$page}'>{$page}</a>&nbsp;"; 
                }else{
                    break;
                }
            }
            $linkPage .= '</b>';
            return $linkPage;
        }
        private function nextlast(){
            if($this->page != $this->pageNum){
                $str = "&nbsp;<a href='{$this->uri}page=".($this->page+1)."'>{$this->config["next"]}</a>&nbsp;";
                $str .= "&nbsp;<a href='{$this->uri}page=".($this->pageNum)."'>{$this->config["last"]}</a>&nbsp;";
                return $str;
            }
        }

        private function goPage(){
            if($this->pageNum > 1){
                return '&nbsp;<input style="width:20px;height:17px;!important;height:18px;border:1px solid #cccccc;"
                    type="text" onkeydown="javascript:if(event.keyCode==13){var page=(this.value>'.$this->pageNum.')?
                    '.$this->pageNum.':this.value;location=\''.$this->uri.'page=\'+page+\'\'}" value=
                    "'.$this->page.'"><input style="cursor:pointer;width:25px;height:18px;border:1px solid #cccccc;"
                    type="button" value="GO" onclick="javascript:var page=(this.previousSibling.value>'.$this->pageNum.
                    ')?'.$this->pageNum.':this.previousSibling.value;location=\''.$this->uri.'page=\'+page+\'\'">&nbsp;';
            }
        
        }
        private function disnum(){
            if($this->total > 0){
                return $this->end()-$this->start()+1;
            }else{
                return 0;
            }
        }

       
       
    
    
}


